Haris Silajdzic said he was "shocked" by Ganic's claims that he was denied access to consular assistance, to a telephone and to his medicine for three days.

He said the foreign secretary, David Miliband, had promised to investigate the complaint.

Ganic had been in the UK for several days before being detained by police. The Serbian government has accused him of being responsible for the deaths of 42 Bosnian-Serb soldiers in May 1992, a month after the start of the Bosnian war.

Silajdzic said that he had met Miliband earlier today to discuss Ganic. He said: "I drew his attention to the fact that he didn't have for three full days access to the telephone and he had problems even with his medicine that he takes usually for treating high blood pressure."

This was a "clear contravention" of European conventions, he added.

"I said that I believe that an apology is owed so that Bosnia-Herzegovina will know that our relations are normal, that this was an aberration of otherwise good and friendly relations with this country," he said.

Ganic's bail request was adjourned last week to give the Serbian authorities more time to submit evidence backing their war crime allegations and oppose bail.

Lawyers for Ganic said moves to make him face trial in Serbia were politically motivated and his arrest was illegal.

Lord Justice Laws today granted the former president bail on what he described as "stringent" conditions.

Under the conditions, Ganic – who is currently being held in Wandsworth prison, in south-west London – has to live at a specified address in the capital and must remain "within the confines" of the property between 10am and 7pm.

He is not allowed to apply for a passport or travel document, and must report to a London police station every day.

Laws said £300,000 had been provided as security by a wellwisher who the court understood was "a lady of substantial means".

Terence Kealey, the vice-chancellor of Buckingham University, paid a further £25,000 surety to be retained if Ganic breached his bail conditions.

Ganic is president of the Sarajevo school of science and technology (SSST). He had been in the UK to attend events at Buckingham University, which is partnered with the SSST.

"Prof Ganic was visiting Buckingham to attend the graduation ceremony of the second cohort of SSST students to have graduated with a degree from Buckingham," a spokeswoman for the university said.

Earlier, a Foreign Office spokesman said Miliband had met Silajdzic this morning.

"They discussed a range of issues, including the UK's strong support for Bosnia and Herzegovina's European perspective," the spokesman said.

"The foreign secretary underlined that the arrest of Dr Ejup Ganic in London on 1 March is a judicial matter, which in no way amounts to a diplomatic or political statement by the British government or any UK point of view on past events in the western Balkans.

"The foreign secretary confirmed that the UK takes its obligations towards foreign nationals in detention very seriously, and that officials will continue to look into any concerns raised by the Bosnian authorities in this regard."